A six-second video posted Wednesday on Twitter shows Ethan Coach standing next to another male who clownishly leaped onto the table, laughing hysterically during a party. There apparently was beer at the party. It's unknown whether he joined in the drinking.

The video was posted by a user named @blondspectre who wrote: “Ya boy Ethan Couch violating probation. I got more if u want.”

The prosecutor says they're investigating to see if Couch did indeed violate probation.

A judge ordered him to spend two years in a luxury rehab.

In 2013, Ethan Couch drunkenly mowed down and killed four people with his pickup truck. His defense triggered outrage with the claim that the teen suffered from Affluenza --- spoiled rotten by wealthy parents who didn't teach him right from wrong.